vsk added a comment.
Thanks for the review!
I looked at the IR and confirmed that the ivars are laid out in the order
they're defined, that the indirect ivar offsets make sense, and that the
runtime ivar offsets match up with what we expect. E.g;
@"OBJC_IVAR_$_FlexibleArray1.chars" = global i64 0 ...
@"\01l_OBJC_$_INSTANCE_VARIABLES_FlexibleArray1" = private global { i32, i32,
[1 x %struct._ivar_t] } ...
---
@"OBJC_IVAR_$_FlexibleArray2.chars" = global i64 0
@"OBJC_IVAR_$_FlexibleArray2.chars2" = global i64 0 ;; < This offset
increases if we sandwich an int between chars and chars2.
@"\01l_OBJC_$_INSTANCE_VARIABLES_FlexibleArray2" = private global { i32, i32,
[2 x %struct._ivar_t] } ...
https://reviews.llvm.org/D22227
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